Re:Google’s new voice recorder app transcribes in Real-Time,...
by gen3 on Wednesday October 16, 2019 @02:04AM
(#21267507)
They also use ML for "Hey Siri" and the face detection in the photos app.
Edit: Here is the article where apple talks about how "Hey Siri" works: https://machinelearning.apple.com/2017/10/01/hey-siri.html
They also used to provide transcripts of voicemail done locally on the phone (although it was not great accuracy)